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Letter bound to have shown sympathy (6)

Ross
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'letter bound' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for twisty that I've seen before include "Bendy, curly" , "Sinuous" , "requiring one to take turns" , "Convoluted" , "Windy" .)

I've seen this clue in The Globe and Mail.
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